Fix git commit operation to gerrit
Fix git commit operation to gerrit

1. Add the `-a` option for adding changes automatically. It is
reported several missing-adding mistakes in past submissions.
2. Add notice on inputing useful commit msg.

Change-Id: If3d13d27f1df139616e95c1e3b0d6292d33efb2c
Signed-off-by: Baohua Yang <dee3cfe538de2f2fa60a015b83efd726c9fa0f84@cn.ibm.com>

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